diff --git a/_includes/footer.html b/_includes/footer.html
index d857a803..166e4057 100644
--- a/_includes/footer.html
+++ b/_includes/footer.html
@@ -83,7 +83,7 @@
   <div class="footer-bottom py-4 text-center">
     <div class="container">
       <div class="copyright">
-        © <span title="{{ site.time | date_to_xmlschema }}">2016-{{ site.time | date: '%Y' }}</span>
+        © <span title="{{ site.time | date: '%Y' }}">2016-{{ site.time | date: '%Y' }}</span>
         SustainOSS.org - Unless otherwise noted, content on this site is licensed under a <a href="https://creativecommons.org/licenses/by-sa/4.0/" rel="noopener" target="_blank">CC-BY-SA 4.0 License</a>
       </div>
       <div class="mt-3">